News from the world of Maths

This is it! The holidays have started, the turkey is defrosting and the presents are all wrapped ... all you have to do now is relax and be kind to one another. So the very last door of our advent calendar is devoted to love. The Plus team wish you a very merry Christmas and a happy new year!

It's time to get out those party invitations! Trouble is, your sister doesn't get on with your boyfriend, your boyfriend doesn't like your best mate, and your best mate's just broken up with your cousin. Who do you invite?

What does Santa have in store for you? Will there be a white Christmas? And will it affect your holiday flight? Life is full of uncertainties, so behind door #15 we've hidden our favourite expert on risk.